QMacNativeWidget focus issue

In the example provided with the documentation of QMacNativeWidget, if I insert two QLineEdit I get a problem of focus ring.
To test this issue you can replace the line
layout->addWidget(pushButton);
by
layout->addWidget(pushButton);
layout->addWidget(new QLineEdit(nativeWidget));
layout->addWidget(new QLineEdit(nativeWidget));